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Web-fed Offset Printing

Web-fed offset presses are production flow lines where the product is also a means of transportation. Web offset presses are usually categorized into either press types operating on the heatset principle for the production of commercial print jobs, magazines, and publications or newspaper offset presses operating on the coldset principle.

A printing couple is the single component used to print ink on one web or sheet side characterized by a plate cylinder and a blanket cylinder (couple) with associated dampening and inking units, whereas a printing unit in web offset printing is composed of several printing couples combined into one closed unit. The simplest version of a printing unit is the vertical blanket-to-blanket one which uses a horizontal web-lead to print one color on the front and reverse side of the web. The printing section is composed of two printing couples arranged in tandem.

In newspaper printing units are arranged more often horizontally than in the vertical because multi-web production is most widely used and it is easier to gather the individual color-printed sections in a vertical line before the individual webs are merged horizontally.